WeakPtr destruction order cleanup: media edition.

media/audio/alsa/alsa_input.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_AUDIO_ALSA_ALSA_INPUT_H_
 #define MEDIA_AUDIO_ALSA_ALSA_INPUT_H_
 
 #include <alsa/asoundlib.h>
 
 #include <string>
@@ skipping 62 matching lines @@
   std::string device_name_;
   AudioParameters params_;
   int bytes_per_buffer_;
   AlsaWrapper* wrapper_;
   base::TimeDelta buffer_duration_;  // Length of each recorded buffer.
   AudioInputCallback* callback_;  // Valid during a recording session.
   base::TimeTicks next_read_time_;  // Scheduled time for next read callback.
   snd_pcm_t* device_handle_;  // Handle to the ALSA PCM recording device.
   snd_mixer_t* mixer_handle_; // Handle to the ALSA microphone mixer.
   snd_mixer_elem_t* mixer_element_handle_; // Handle to the capture element.
-  base::WeakPtrFactory<AlsaPcmInputStream> weak_factory_;
   scoped_ptr<uint8[]> audio_buffer_;  // Buffer used for reading audio data.
   bool read_callback_behind_schedule_;
 
+  // NOTE: This must always be last so it's invalidated before other member
+  // variables might be accessed.
+  base::WeakPtrFactory<AlsaPcmInputStream> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(AlsaPcmInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_ALSA_ALSA_INPUT_H_